 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.update.internal.ui.views;

 import java.lang.reflect.InvocationTargetException ;

 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.jface.dialogs.ErrorDialog;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.update.internal.core.InstallRegistry;
 import org.eclipse.update.internal.operations.OperationFactory;
 import org.eclipse.update.internal.operations.UpdateUtils;
 import org.eclipse.update.internal.ui.UpdateUI;
 import org.eclipse.update.internal.ui.UpdateUIMessages;
 import org.eclipse.update.internal.ui.model.ConfiguredFeatureAdapter;
 import org.eclipse.update.operations.IFeatureOperation;
 import org.eclipse.update.operations.IOperation;
 import org.eclipse.update.operations.OperationsManager;

 public class UnconfigureAndUninstallFeatureAction extends FeatureAction {

     private ConfiguredFeatureAdapter adapter;

     public UnconfigureAndUninstallFeatureAction(Shell shell, String text) {
         super(shell, text);
         setWindowTitle(UpdateUIMessages.FeatureUnconfigureAndUninstallAction_dialogTitle);
     }

     public void run() {
         try {
             IStatus status = OperationsManager.getValidator().validatePlatformConfigValid();
             if (status != null)
                 throw new CoreException(status);
             
             if (adapter == null || !confirm(UpdateUIMessages.FeatureUnconfigureAndUninstallAction_question))
                 return;

             // If current config is broken, confirm with the user to continue
 if (OperationsManager.getValidator().validateCurrentState() != null &&
                     !confirm(UpdateUIMessages.Actions_brokenConfigQuestion))
                 return;

             IOperation operation =
                 ((OperationFactory)OperationsManager.getOperationFactory()).createUnconfigureAndUninstallFeatureOperation( adapter.getConfiguredSite(), adapter.getFeature(null));

             boolean restartNeeded = operation.execute(null, null);
             UpdateUI.requestRestart(restartNeeded);

         } catch (CoreException e) {
             ErrorDialog.openError(shell, null, null, e.getStatus());
         } catch (InvocationTargetException e) {
             // This should not happen
 UpdateUtils.logException(e.getTargetException());
         }
     }



     public void setSelection(IStructuredSelection selection) {
         
         this.adapter = (ConfiguredFeatureAdapter) selection.getFirstElement();
         setText(UpdateUIMessages.FeatureUnconfigureAndUninstallAction_uninstall);
     }
     
     
     public boolean canExecuteAction() {
         if (adapter == null)
             return false;
         
         if (!adapter.isConfigured())
             return false;
         
         try {
             // check for pending changes (e.g. if the feature has just been disabled)
 IFeatureOperation pendingOperation = OperationsManager.findPendingOperation(adapter.getFeature(null));
             if (pendingOperation != null)
                 return false;

             if (InstallRegistry.getInstance().get("feature_"+adapter.getFeature(null).getVersionedIdentifier()) == null) //$NON-NLS-1$
 return false;
         } catch (CoreException e) {
             return false;
         }
                 
         return true;
     }
 }

